What is it CHECK constraint failed: subject <> ''? - sql

Question

What is it CHECK constraint failed: subject <> '' ?
I get an error with stmt, err_execontext := s.db.ExecContext(ctx, insert, subject, description).
How can I solve this?
type TODOService struct {
db *sql.DB
}
// NewTODOService returns new TODOService.
func NewTODOService(db *sql.DB) *TODOService {
return &TODOService{
db: db,
}
}
// CreateTODO creates a TODO on DB.
func (s *TODOService) CreateTODO(ctx context.Context, subject, description string) (*model.TODO, error) {
const (
insert = `INSERT INTO todos(subject, description) VALUES(?, ?)`
confirm = `SELECT subject, description, created_at, updated_at FROM todos WHERE id = ?`
)
stmt, err_execontext := s.db.ExecContext(ctx, insert, subject, description)
if err_execontext != nil {
log.Fatal("server/todo.go 31行目", err_execontext)
}
created_id, err_iserid := stmt.LastInsertId()
if err_iserid != nil {
log.Fatal("server/todo.go 35行目", err_iserid)
}
var todo model.TODO
err := s.db.QueryRowContext(ctx, confirm, created_id).Scan(&todo.Subject, &todo.Description, &todo.CreatedAt, &todo.UpdatedAt)
switch {
case err == sql.ErrNoRows:
log.Fatalf("no todo with id %d", created_id)
case err != nil:
log.Fatal(err)
}
return &todo, err
}
type TODOHandler struct {
svc *service.TODOService
}
// NewTODOHandler returns TODOHandler based http.Handler.
func NewTODOHandler(svc *service.TODOService) *TODOHandler {
return &TODOHandler{
svc: svc,
}
}
// Create handles the endpoint that creates the TODO.
func (h *TODOHandler) Create(ctx context.Context, req *model.CreateTODORequest) (*model.CreateTODOResponse, error) {
created_todo, err := h.svc.CreateTODO(ctx, req.Subject, req.Description)
if err != nil {
log.Fatal("Failed to", err)
}
return &model.CreateTODOResponse{TODO: *created_todo}, nil
}
type (
// A TODO expresses ...
TODO struct{
ID int `json:"id"`
Subject string `json:"subject"`
Description string `json:"description"`
CreatedAt time.Time `json:"createdAt"`
UpdatedAt time.Time `json:"UpdatedAt"`
}
// A CreateTODORequest expresses ...
CreateTODORequest struct{
Subject string `json:"subject"`
Description string `json:"description"`
}
// A CreateTODOResponse expresses ...
CreateTODOResponse struct{
TODO TODO `json:"todo"`
}
)
What is it CHECK constraint failed: subject <> '' ?
I get an error with stmt, err_execontext := s.db.ExecContext(ctx, insert, subject, description).
How can I solve this?
CREATE TABLE IF NOT EXISTS todos (
id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
subject TEXT NOT NULL,
description TEXT NOT NULL DEFAULT '',
created_at DATETIME NOT NULL DEFAULT (DATETIME('now')),
updated_at DATETIME NOT NULL DEFAULT (DATETIME('now')),
CHECK(subject <> '')
);
CREATE TRIGGER IF NOT EXISTS trigger_todos_updated_at AFTER UPDATE ON todos
BEGIN
UPDATE todos SET updated_at = DATETIME('now') WHERE id == NEW.id;
END;